/*
 * Copyright (c) 2013 - 2015, Freescale Semiconductor, Inc.
 * Copyright 2016-2017 NXP
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * o Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 *
 * o Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "app_inc.h"

/*******************************************************************************
 * Definitions
 ******************************************************************************/
#define APP_CTIMER_PWM_BASE   CTIMER1

/*******************************************************************************
 * Variables
 ******************************************************************************/

/*******************************************************************************
 * Prototypes
 ******************************************************************************/
void PWM_Configuration(void);
void PWM_UpdateDuty(ctimer_match_t matchChn , uint32_t dutyPercent);

/*******************************************************************************
 * Code
 ******************************************************************************/
/*!
 * @brief Main function
 */
int main(void)
{
    char ch;
    uint32_t dutyPercent;
    bool bDutyDirInc; /* 占空比的变化方向 */

    /* Init board hardware. */
    BOARD_InitPins();
    BOARD_BootClockRUN();

    /* Initialize debug console. */
    BOARD_InitDebugConsole(); /* Flexcomm0 - UART0, 115200. */

    PRINTF("\r\nCTimer_MultiplePWMOutput Demo.\r\n");
    PRINTF("build time: %s, %s\r\n", __TIME__, __DATE__);

    PWM_Configuration();

    PRINTF("FRO 12M: %d\r\n", CLOCK_GetFreq(kCLOCK_Fro12M));
    
    dutyPercent = 0U;
    bDutyDirInc = true;
    while (1)
    {
        ch = GETCHAR();
        PUTCHAR(ch);

        /* 计算更新的占空比 */
        if (bDutyDirInc == true)
        {
            if (dutyPercent < 100U)
            {
                dutyPercent += 5U;
                if (dutyPercent >= 100U)
                {
                    bDutyDirInc = false; /* 反向 */
                }
            }
        }
        else
        {
            if (dutyPercent > 0U)
            {
                dutyPercent -= 5U;
                if (dutyPercent == 0U)
                {
                    bDutyDirInc = true;
                }
            }
        }
        
        PRINTF("dutyPercent: %d\r\n", dutyPercent);
        PWM_UpdateDuty(kCTIMER_Match_0, dutyPercent);
        PWM_UpdateDuty(kCTIMER_Match_1, dutyPercent);
        PWM_UpdateDuty(kCTIMER_Match_2, dutyPercent);
    }
}

void PWM_Configuration(void)
{
    ctimer_config_t CTimerConfigStruct;

    CTimerConfigStruct.mode = kCTIMER_TimerMode;
    CTimerConfigStruct.prescale = 0U; /* 从时钟源到计数节拍的分频因子 */
    CTIMER_Init(APP_CTIMER_PWM_BASE, &CTimerConfigStruct);

    /* BusClk即为AHB总线时钟 
    *  初始化的占空比为0，有效值在0-100之间
    *  PWM信号的频率设定为15KHz
    *  使用FRO 12M的12MHz时钟源，并且未被分频
    *  在翻转点不产生中断
    */
    CTIMER_SetupPwm(APP_CTIMER_PWM_BASE, kCTIMER_Match_0, 0U, 15000U, CLOCK_GetFreq(kCLOCK_BusClk), false);
    CTIMER_SetupPwm(APP_CTIMER_PWM_BASE, kCTIMER_Match_1, 0U, 15000U, CLOCK_GetFreq(kCLOCK_BusClk), false);
    CTIMER_SetupPwm(APP_CTIMER_PWM_BASE, kCTIMER_Match_2, 0U, 15000U, CLOCK_GetFreq(kCLOCK_BusClk), false);

    CTIMER_StartTimer(APP_CTIMER_PWM_BASE);
}

void PWM_UpdateDuty(ctimer_match_t matchChn , uint32_t dutyPercent)
{
    CTIMER_UpdatePwmDutycycle(APP_CTIMER_PWM_BASE, matchChn, dutyPercent);
}

/* EOF. */
